<html>
	<head>
		<script type="text/javascript">
		function validate_required(filed, alerttxt)
		{
			with(filed)
			{
				if (value==null || value=="") {
					alert(alerttxt)
					return false
				}
				else{return true}
			}
		}

		function validate_form(thisform)
		{
			with(thisform)
			{
				if(validate_required(email,"Email must be filled out!")==false)
					{email.focus();return false}
			}
		}
		</script>
	</head>
	<body>
		<form action="submitpage.html" onsubmit="return validate_form(this)" method="post">
			Email: <input type="text" name="email" size="30">
			<input type="submit" value="Submit">
		</form>
	</body>
</html>